The Bently Nevada 330730-080-00-00 serves as the primary 330730 Extension Cable utilized to execute high-frequency analog signal transmission across 3500 Machinery Protection System platforms. It conducts high-frequency radio frequency excitation currents and returns dynamic AC vibration and DC gap voltage signals between an 11 mm proximity probe and a Proximitor sensor without phase distortion or amplitude loss.
Suffix Breakdown & Model Matrix
The suffix structure for the 330730-080-00-00 ordering code defines the following physical specifications:
- 330730: Base Model Designation for 3300 XL 11 mm Extension Cable.
- 080: Cable Length Option – 8.0 metres (26.2 feet).
- 00: Connector and Cable Option – Standard cable construction with miniature coaxial connectors.
- 00: Agency Approval Option – Not required (Standard non-hazardous area configuration).
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 330730-080-00-00 |
| Brand | Bently Nevada |
| Origin | United States |
| Weight | 0.28 kg (Shipping Weight: 2.0 kg) |
| Dimensions | 8.0 m cable length, 11 mm system standard |
| Operating Temp | -51 deg C to +177 deg C |
| Power Consumption | Passive physical conductor (0 W) |
| Relative Humidity | Up to 100% non-submerged (hermetically-sealed case/connectors) |
| System Total Length | 8.0 m cable (configured for 9.0 m total matched system length with 1.0 m probe) |
| Cable Type | 75 ohm miniature coaxial cable with FEP outer jacket |
| Connector Type | ClickLock miniature coaxial male/female connectors |
Gap Voltage Validation and Cross-Talk Suppression
The 330730-080-00-00 extension cable maintains tight capacitive balance (69.9 pF/m nominal) to prevent scale factor degradation in eddy-current probe calibration circuits. Proper impedance matching ensures predictable linear displacement conversion across the entirety of the probe dynamic measuring range.
During loop commissioning, field personnel perform gap voltage validation across the signal terminals to verify a target reading of approximately -10 VDC at the mechanical center position. The coaxial outer shield combined with proper physical conduit routing provides cross-talk suppression and isolates high-frequency raw vibration signals from external electromagnetic interference (EMI).
Frequently Asked Questions
Q: Can an 8.0 m extension cable be interchanged with a 4.0 m extension cable without recalibrating the Proximitor sensor?
A: No. A 3300 XL Proximitor sensor is calibrated to a specific total system length (typically 5.0 m or 9.0 m). Replacing an 8.0 m cable with a different length alters the system capacitance, invalidating factory calibration curves and introducing displacement errors.
Q: Is the 330730-080-00-00 extension cable suitable for continuous immersion in liquids?
A: No. While the cable assembly features hermetically-sealed connector housings rated for up to 100% relative humidity, it is specified as non-submerged. Continuous liquid immersion requires liquid-tight protective conduit and sealed outer junction fittings.
Field Installation Guidelines
- Inspect the cable outer FEP jacket and ClickLock coaxial connectors for cuts, pin contamination, or bending prior to installation.
- Pull the cable through dedicated electrical conduits or metal raceways, ensuring the minimum static bend radius of 25.4 mm (1.0 in) is preserved along the entire run.
- Maintain a minimum separation distance of 300 mm between the extension cable routing and high-voltage AC power lines or variable frequency drive (VFD) outputs.
- Align the coaxial ClickLock connectors, press until fully engaged, and secure hand-tight plus 1/8 turn. Avoid using excessive mechanical wrenching force.
- Confirm gap voltage validation using a calibrated digital multimeter at the Proximitor terminal block; target value should read close to -10.0 VDC when the shaft is centered in its bearing clearance.
- Connect the inner coaxial shield to the designated system instrument earth at the Proximitor housing end only. Leave the probe end ungrounded to prevent earth potential loops.
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